Postgres95 1.01 Distribution - Virgin Sources

src/backend/utils/adt/tid.c

@@ -0,0 +1,92 @@
+/*-------------------------------------------------------------------------
+ *
+ * tid.c--
+ *    Functions for the built-in type tuple id
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *    $Header: /cvsroot/pgsql/src/backend/utils/adt/tid.c,v 1.1.1.1 1996/07/09 06:22:05 scrappy Exp $
+ *
+ * NOTES
+ *    input routine largely stolen from boxin().
+ *
+ *-------------------------------------------------------------------------
+ */
+#include <stdio.h>		/* for sprintf() */
+#include <string.h>
+#include "postgres.h"
+#include "storage/block.h"
+#include "storage/off.h"
+#include "storage/itemptr.h"
+#include "storage/bufpage.h"
+
+#include "utils/palloc.h"
+#include "utils/builtins.h"	/* where function declarations go */
+
+
+#define LDELIM		'('
+#define RDELIM		')'
+#define	DELIM		','
+#define NTIDARGS	2
+
+/* ----------------------------------------------------------------
+ *	tidin
+ * ----------------------------------------------------------------
+ */
+ItemPointer
+tidin(char *str)
+{
+    char		*p, *coord[NTIDARGS];
+    int			i;
+    ItemPointer		result;
+    
+    BlockNumber  	blockNumber;
+    OffsetNumber	offsetNumber;
+    
+    if (str == NULL)
+	return NULL;
+    
+    for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
+	if (*p == DELIM || (*p == LDELIM && !i))
+	    coord[i++] = p + 1;
+    
+    if (i < NTIDARGS - 1)
+	return NULL;
+    
+    blockNumber =	(BlockNumber) 	atoi(coord[0]);
+    offsetNumber = 	(OffsetNumber)	atoi(coord[1]);
+    
+    result = (ItemPointer) palloc(sizeof(ItemPointerData));
+    
+    ItemPointerSet(result, blockNumber, offsetNumber);
+    
+    return result;
+}
+
+/* ----------------------------------------------------------------
+ *	tidout
+ * ----------------------------------------------------------------
+ */
+char *
+tidout(ItemPointer itemPtr)
+{
+    BlockNumber  	blockNumber;
+    OffsetNumber	offsetNumber;
+    BlockId	 	blockId;
+    char		buf[32];
+    char		*str;
+    
+    blockId =	 &(itemPtr->ip_blkid);
+    
+    blockNumber =  BlockIdGetBlockNumber(blockId);
+    offsetNumber = itemPtr->ip_posid;
+    
+    sprintf(buf, "(%d,%d)", blockNumber, offsetNumber);
+    
+    str = (char *) palloc(strlen(buf)+1);
+    strcpy(str, buf);
+    
+    return str;
+}